At the RNCM, she has sung in the choruses of La bohème and Le nozze di Figaro and appeared in many excerpts, including: Countess, Le nozze di Figaro; Octavian, Der Rosenkavalier; Laetitia, The Old Maid and the Thief; Clorinda, La Cenerentola; Leonore, Fidelio; Marenka, The Bartered Bride; and Agathe, Der Freischütz.

In March 2001, Rebecca sang the role of Alice Ford in the RNCM production of Verdi's Falstaff, and covered the role of Helena in Sir Peter Hall's production of A Midsummer Night's Dream for Glyndebourne Festival Opera, whilst singing in the chorus. In 2002, as well as again singing in the chorus, she sang the role of Bertha, Euryanthe, conducted by Mark Elder.

Rebecca won the Joyce and Michael Kennedy Prize for the singing of Strauss in 2001, the Clonter Opera and Audience Prize 2002, the Joaninha Award 2002, and the Elizabeth Harwood Memorial Award 2002. She has recently completed her studies on the 2002/03 course at the National Opera Studio supported by the Anne Wood/Johanna Peters Award from Glyndebourne and the Peter Moores Foundation.